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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <parc/algol/parc_Object.h>
#include <parc/algol/parc_DisplayIndented.h>
#include <parc/concurrent/parc_AtomicUint16.h>
struct PARCAtomicUint16 {
uint16_t value;
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_t mutex;
#endif
};
static void
_parcAtomicUint16_Finalize(PARCAtomicUint16 **instancePtr)
{
parcAssertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCAtomicUint16 pointer.");
parcAtomicUint16_OptionalAssertValid((*instancePtr));
/* cleanup the instance fields here */
}
parcObject_ImplementAcquire(parcAtomicUint16, PARCAtomicUint16);
parcObject_ImplementRelease(parcAtomicUint16, PARCAtomicUint16);
parcObject_ExtendPARCObject(PARCAtomicUint16, _parcAtomicUint16_Finalize, parcAtomicUint16_Copy, NULL, parcAtomicUint16_Equals, parcAtomicUint16_Compare, parcAtomicUint16_HashCode, NULL);
void
parcAtomicUint16_AssertValid(const PARCAtomicUint16 *instance)
{
parcAssertTrue(parcAtomicUint16_IsValid(instance),
"PARCAtomicUint16 is not valid.");
}
PARCAtomicUint16 *
parcAtomicUint16_Create(uint16_t value)
{
PARCAtomicUint16 *result = parcObject_CreateAndClearInstance(PARCAtomicUint16);
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_init(&result->mutex, NULL);
result->value = value;
#else
*result = value;
#endif
return result;
}
int
parcAtomicUint16_Compare(const PARCAtomicUint16 *instance, const PARCAtomicUint16 *other)
{
int16_t comparison = parcAtomicUint16_GetValue(instance) - parcAtomicUint16_GetValue(other);
int result = 0;
if (comparison < 0) {
result = -1;
} else if (comparison > 0) {
result = 1;
}
return result;
}
PARCAtomicUint16 *
parcAtomicUint16_Copy(const PARCAtomicUint16 *original)
{
PARCAtomicUint16 *result = parcAtomicUint16_Create(parcAtomicUint16_GetValue(original));
return result;
}
bool
parcAtomicUint16_Equals(const PARCAtomicUint16 *x, const PARCAtomicUint16 *y)
{
bool result = false;
result = parcAtomicUint16_GetValue(x) == parcAtomicUint16_GetValue(y);
return result;
}
PARCHashCode
parcAtomicUint16_HashCode(const PARCAtomicUint16 *instance)
{
PARCHashCode result = (PARCHashCode) parcAtomicUint16_GetValue(instance);
return result;
}
bool
parcAtomicUint16_IsValid(const PARCAtomicUint16 *instance)
{
bool result = false;
if (instance != NULL) {
result = true;
}
return result;
}
uint16_t
parcAtomicUint16_GetValue(const PARCAtomicUint16 *instance)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
return instance->value;
#else
return *instance;
#endif
}
uint16_t
parcAtomicUint16_AddImpl(PARCAtomicUint16 *value, uint16_t addend)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
value->value += addend;
uint16_t result = value->value;
pthread_mutex_unlock(&value->mutex);
return result;
#else
return __sync_add_and_fetch(value, addend);
#endif
}
uint16_t
parcAtomicUint16_SubtractImpl(PARCAtomicUint16 *value, uint16_t subtrahend)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
value->value -= subtrahend;
uint16_t result = value->value;
pthread_mutex_unlock(&value->mutex);
return result;
#else
return __sync_sub_and_fetch(value, subtrahend);
#endif
}
bool
parcAtomicUint16_CompareAndSwapImpl(PARCAtomicUint16 *value, uint16_t predicate, uint16_t newValue)
{
bool result = false;
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
if (value->value == predicate) {
value->value = newValue;
result = true;
}
pthread_mutex_unlock(&value->mutex);
return result;
#else
result = __sync_bool_compare_and_swap(value, predicate, newValue);
#endif
return result;
}
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